Syringe projector



Feb. 12, 1935. G. KING SYRINGE PROJECTOR Filed Jan. 8, 1934 w (i t; 4

v Mm Q INVENTV'OR" Cieofge Jiliing A TTORNEYS I Patented Feb. 12, 1935{PATENT OFFICE smmen morno'ron George L. King, St. Paul, Mimn, asaignorto A. W. Magnnson, Stillwater, Minn.

Application January 8, 1934, Serial No. 705,695 4 Claims. (Cl. 128-218)The present invention relates to a hypodermic syringe projector.

Various types of syringeprojectors have been previously devised, butmost of these have either been adapted for only one size of syringe orhave been of a type wherein the syringe gripping device has been of atype which was apt to cause breakage of the syringes in use.

An object of the present invention is to make animproved and simplifiedhypodermic syringe projector.

Another object of the present invention is to make a syringe projectoruniversally adapted to use difierent sizes of ordinary hypodermicsyringes with different lengths of needles.

In order to accomplish these objects, there is provided, in accordancewith one feature of the invention, a support member having a foot pieceadapted to rest on the patients skin adjacent the desired point ofpenetration, and a spring propelled carriage slidably mounted on thesupport member and having resiliently actuated means mounted to hold asyringe in close frictional engagement with a, carriage element.

These and other features of the invention will be more fully brought outin the following description and the accompanying drawing, wherein:

Figure 1 is a view in perspective of a syringe projector embodying thepresent invention, with a hypodermic syringe positioned therein.

Figure 2 is a longitudinal sectional view through the device shown inFigure 1, with syringe removed.

Figure 3 is an end view of the device shown in Figure l, the cover beingshown in engagement with a small syringe in solid lines, and with alarge syringe in dotted lines.

Figure 4 is a view similar to that of Figure 3 with a modifiedfrictional syringe engaging arrangement.

Figure 5 is a view in perspective of a triotional syringe engagingmember as shown in Figure 4.

Figure 6 is a side view of a modified form of syringe projector.

,Figure '7 is a view in longitudinal, vertical, central section of thedevice shown in Figure 6.

Figure 8 is a rear end view of the device shown in Figures 6 and 7 andFigure 9 is a modified form of carriage to be used with a body portionsuch as is shown in Figures 6 to 8, inclusive.

Referring to the drawing in detail, the device comprises a body portionA having a forked foot piece 1 projecting downwardly therefrom. A pairof grooves 2 are provided, one on each side of a longitudinally disposedrecess 3 in the body portion A. A pair of arcuatelycurved flanges 4 and5 are provided, one on each side 5 of the body A to receive acylindrically curved 'can'lage B.

The carriage B has a downwardly projecting ridge 6, extendinglongitudinally thereof, with tracks 7 and 8 projecting one on each. sidethereof for free, slidable movement in the ooves 2. I

A coil spring 9 is connected at one end to a lug 10 on the outer end ofthe ridge 6, and at the other to a lug 11 in the bottom of the recess 3.

A trigger 12 is pivotally mounted as at 13 to be resiliently held inengaging position, as by means of the looped end portion 14 (seeFigure 1) with its .upper end 12-a in inwardly pressed position. A notch15 is provided in the track 8 to receive the upper end 12-4: of thetrigger 12 when the carriage B is drawn back against the tension of thespring 9 to a cocked position, as shown in Figure 1, and in solid aslines in Figure 2.

A spring pressed cover 16 is hingedly mounted as at 26 on an edge of thecarriage B and is resiliently held in closed position by a spring 17.The cover 16 is preferably cut away as at 18 to disclose the syringe 19when mounted there-- A plurality of friction plugs 20 are mounted alongthe center of the carriage B to frictionally grip the syringe 19 whenpressed against them by the resilient cover action. A buffer plug 21 isalso provided in the'lower end of the carriage to encounter the lowerend of the recess 3 to cushion the impact on releasing the carriageduring an operation of the device.

In the form shown in Figures 4 and 5 a pair of frictional strips 22 and23 are mounted in longitudinally disposed grooves in the carriage toresiliently support a syringe mounted in the carriage and tofrictionally hold it against material longitudinal displacement duringactuation when the syringe is gripped by the cover 16.

The rear comer 24 of the carriage B, opposite to the cover hinge, is cutaway at an angle so that by holding the syringe at an angle 01' aboutforty-five degrees to the longitudinal axis of the carriage and pressingit inwardly, this surface 24 acts as a cam to raise the cover and admitthe syringe. I

In the modified form shown in Figures 6 to 8, inclusive, the bodyportion A is deeper and narrower than that shown in Figures 1 to 3, andis provided with flutings 30 to provide a suitable grip for theoperator's hand. A cylindrical recess 31 is provided in the body portionA to slidably receivea tubular projection 32 on the'carriage B. A coilspring 33 is mounted within the tubular carriage projection 32 and isfastened to the carriage by a pin 34 and to the body portion by a pin35, to normally hold the carriage in the actuated position shown inFigures 6 and "I. A short piece of rubbertubing 36 is placed over theforward end of the spring 33 to act as a butler between the forward endof the carriage and theforward end of the recess 31. A frictionalcushion 37 is mounted in the curved upper face of the carriage tofrictionally enga'ge a syringe when mounted therein in the same generalmanner as shown in Figures 1 and '3. As a syringe retaining element, acoil spring 38 is mounted around a pin 39, and is provided with astraight sided loop 40 which lies transversely across the top of thecarriage and is resiliently held down toward the carriage by the actionof the coil spring 38.

A trigger 41 is mounted similarly to the trigger 12 shown, in Figures 1and 3 to releasably hold the device in cocked position.

In the modified carriage C, shown in Figure 9, the side walls 42 and 43o! the syringe are carried up a distance greater than the radius of thesyringe barrel for which the device is designed. A resilient frictionpad 44 is mounted in the carriage wall 43 to be spaced from the upper,end 45 of the opposite wall 42 a distance slightly less than thediameter of the syringe barrel.

The method of inserting the syringe in the carriage is illustrated bythe two dotted and one solid-circles in this view. The syringe barrelindicated by these circles is laid along the top of the carriage in theposition shown by the upper circle 46 to rest on the pad 44 and theupper edge 45 of the opposite wall. The syringe barrel is then forceddownwardly, compressing the pad 44 by means of the cam action exerted bythe engagement of the syringe with the oppo site wall, to the positionindicated by the middle circle 47. This is the dead center positionafter the passing of which the resilience of the pad forces the barreldown to the solid line position 48 in which position the syringe isfirmly held in the carriage. To remove the syringe the above procedureis reversed. While not having the wide latitude with respect to thesizes of syringes which the device is capable of handling as thestructures shown in Figures 1 to 8, inclusive, the carriage shown inFigure 9 is preferred for certain specific uses, as will be apparent tothose versed in the art.

In using the device the syringe is assembled with a suitable needle andtilled in a customary manner, and is then inserted in the carriage withthe device in the operated or released posi tion; as shown in dottedlines in Figure 2. The syringe is then adjusted longitudinally of thecarriage so that the needle projects beyond the forked foot piece 1 adistance approximately equal to the amount of penetration required. Thisadjustment may be readily accomplished by grasping the sides of thecarriage with one hand and moving the syringe slidably longitudinallythereof with theother hand, since the frictional grip of the device,while suiiicient to hold the syringe in adjusted position duringoperation, may be readily overcome by manual manipulation inthis'manner. The carriage B is then drawn'back until the notch in thetrack 8 is engaged by the trigger 12 which holds the device in cockedposition.

The footpiece 1 is then placed on the patients skin around the desiredpoint of penetration and the trigger 12 moved to release it from thenotch in the track 8. The spring 9 drives the carriage downward,plunging the needle into the patient's flesh to the required depth.

A slight slippage occurs between the syringe and the carriage during theactuation of the device, in actual use between one thirty-second andone-sixteenth of an inch, which is believed to be a material advantagein that it prevents undue strain on the syringe. In actual. use with alltypes and sizes of syringes over a period of more than a year, andincluding over two thousand actual injections as well as experimentalusage in cotton and rubber compositions, not one syringe or needle hasbeen broken.

The device is simple and positive in operation, and universal in itsapplication within the extreme limits of its capacity so that itaccommodates all syringes in common use for subcutaneous injection.

I claim:

1. A hypodermic syringe projector, comprising a body portion, a springpropelled carriage slidably mounted on said body portion and formed witha rest support for a hypodermic syringe, and a resiliently controlledcover mounted on one side of said body portion in position to engage thesyringe, for the purpose set forth.

2. A hypodermic syringe projector, comprising a body portion, a springpropelled carriage slidably mounted on said body portion and formed witha supporting seat for the syringe, a spring-pressed cover mounted uponsaid body portion in opposed position to the supporting seat for thesyringe, and a friction pad carried by said body portion in position toengage with said syringe when the same is seated in position.

3. A hypodermic syringe projector, comprising abody portion, a springpropelled carriage slidably mounted on said body portion and formed witha supporting seat for the syringe, a spring-pressed cover mounted uponsaid body portion in opposed position to the supporting seat for thesyringe, a friction pad carried by said body portion in position toengage with said syringe when the same is seated in position, andreleasable trigger means for holding said carriage in withdrawnposition.

4. A hypodermic syringe projector, comprising a body portion, a springpropelled carriage mounted thereon, said carriage being formed with aseat portion for the syringe, means resiliently supported by said bodyportion in opposition to the seat portion of said carriage to grip anintermediate syringe, said means being relatively adjustable to makecontact with varying sizes of syringes, and a pad element engaging withsaid syringe when in gripping position.

GEORGE L. ENG.

